Looks like you have created the database and the user, hopefully you gave this user (u557442447_242) a password which you remember also. You can use the bottom dialog to reset the password for this user (242) if neccessary.

Now, you have to find the file called config-dist.php in your moodle folder. make a copy of that file called config.php. Edit config.php and supply the information needed - database type (mysqli), username, password (from the screen above).

Osmildo, witht he advice that you have received, you might be fine now. However, if you are still having problems, might I ask you how you have tried installing Moodle? For example, are you using a one-click install routine from your web hosting company, or are you installing Moodle from scratch yourself? Also, who might your web hosting company be, and is this a "hosted" server or a VPS?